Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81549d4157d07efbbe9c1e44dfb6c7e7481c31adf4a49f1411a9a6827c6ab24f' 
  AND token = 'kNAGRDj6EEadvLQHtSlMF6b92OhM45uCunny/udiO0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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