Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121b1c2d04dff850b8d817b2f8a15da8c7ca3d313eba141146f45eae2427e367' 
  AND token = 'Y3VGqrIoqKZXt+Q4nc8tWRbhkhIjwXQVsinXznFvsr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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