Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f1038d77aa5915df38eb8e5f52b0c33f0f54f3c2cbea1edffffdc2adf2c157' 
  AND token = 'b1b+JZcGwcQsfesTxwH2/GxK85PZeX6tYmf6jTUMX9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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