Put up a site first with decent on-page, get it ranked for that keyword then 301 at a later date. Without substance, it's just a domain.
FYI, I bought an 18 year old domain in the clown industry (seriously..) and am using it for a totally different niche. Got a good boost to page 2 after 2 weeks and now I'm struggling to get it moving any higher. It's a test site on really aged domains. The DA/link profile was low but the domain was cheap, hence the test. Saying that, I could probably rank a fresh domain (non-EMD) for the same keywords in a 4 weeks at a guess (which is the next test).