Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3016417ec989b98c12c35e709aff5b817524967a32f0cef903a98b5b6e5783' 
  AND token = '2rPhGzOZJfHM/WRme8K4h9zAd9s2Ji1YUasidMEjfDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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