These are the two that I have on my keychain…
I think they fit your requirements.
https://budgetlightforum.com/t/review-rovyvon-aurora-a23-amazing-keychain-flashlight/70521
https://budgetlightforum.com/t/review-tunenge-s15-keychain-flashlight-gives-rovyvon-a-run-for-their-money/219617
There are smaller RovyVon keychain flashlights (than the Aurora A23) that are also nice, but they’re more expensive than the Tunenge S15.
Although I like the Aurora A23, it’s pricey, and somewhat large. 
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