Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba7c88d788f2e97ca328e8ce819939d8c9db52b9decd973abbd6f66a9a3d07c' 
  AND token = 'a0giLqLXop+pRMFwjzqXmwqV0FMGzGc6/M1HeM0LTYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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