Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419cb6904dca99f13de75e9b513786779501e4fd29dbbec28c6994b1cddfa570' 
  AND token = 'Zj+t6KiHDOLxkojQp40VYVrobkBeujdYLP5zYnwZXHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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