Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f64e0e1cfb41943f1022810916669e94b706920b518bdd3c60d0ca8cc34ec7' 
  AND token = '534BKfc4lnkEzUrKBmZ4hVXUrVs7dC07VE0gnB4YfvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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