SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f8ace59cbfaf93f15c6a2980d17b9e5cdeb17bf6c54f4608818bff37ccfde1c5' 
  AND token = 'DFmZy8Js1mJxSFZqAtSvGI0HS8FtGXwd2m1aYRIlGgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}