Sandbox

SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f90487963f1bd8b725a4aa9f9919d0d1d254bcef3e9b08f48a55c0e697b40471' 
  AND token = 'JebErLywUfx6G0P3Sk++hYIuR7dQxJiJxYRmu4IzUPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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