Exacte keyword in URL?

Hi all, does anybody know how much of a difference it makes in terms of SEO if my URL is:
https://site.com/my-exact-keywordversus
https://site.com/this-is-my-exact-keyword-check-it-out
?
For a new page, I think it's always better to use the first one (correct me if I'm wrong). But for an old page that already ranks well, should I change the URL to match the exact keyword and hope to gain a few ranks in the SERP? Or is it a bad idea because it will create a redirection?
Thanks!

I've seen all sorts of URL structures ranking in google, from the ugliest you can think of (full of weird characters, hyphens and symbols) to URLs that had only one letter in them after the root domain.

So, I don't think it matters too much (if at all). Just give your URL a short, descriptive name that contains one relevant word so you can know what that page is about if you see its URL, and move on!

it's really very important point of SEO, it will not only increase the chances of your page to rank in google SERP on that keyword, but also increase chances of higher CTR. So keywords in URL is really important part of On-Page SEO

Keep the slug short and simple

I've tried using default slug from post name as well as exact long tail kw
Hardly makes any difference

Including the exact keyword in your post URL can make a difference, but you have to understand that this is just one factor to consider.

You may dot all your I's and cross all your T's when it comes to an SEO checklist, but if you overlook the most important part, all that effort just goes up in smoke.

No joke!

What am I talking about?

I'm talking about delivering on the intent searchers for your target keyword have when they use that keyword.

Put yourself in their shoes.

When you type in your target keyword into Google, what are you looking for?

Put more specifically, what kind of experience are you looking for?

Your content has to deliver on that.

Sure, it can help.

Even if you have an exact keyword in your URL and you mentioned the keyword in your meta-description as well as in the first paragraph of your content along with a few mentions in the subheadings and of course in the body, but at the end of the day you have to deliver the goods.

Focus on the experience your content creates and everything else will fall into line.

I suggest you focus on the heart of the content and then backtrack to the more technical aspects because, without the heart, you're just wasting your time.

I always try to keep the URLs of my websites short and straightforward. For example, if there is a keyword "buy [product] in [city] cheap" the URL would most likely be something like:
/product
or
/city/product

But not /buy-product-in-city-cheap

This way we include the keyword but do not overplay it