Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504d621b6d5bbfc4e25d7c93b45e208dea1425df972adb256199f2ad0f198cbe' 
  AND token = '6vii1cuLHIZtTx7O/ZFsVEBDZLt+F0cLhW5CgInxNKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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