Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2470e4fb3ae6832926a3cefcc2a8c544af9de12cd9c8ef9fd9dd01fc9754d15f' 
  AND token = 'QDNeZRqxGVXeqOepXZuycOQa2AvWR76+7BgFuXuMaXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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