Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1977999b417a00a8b20372f361cf963a8e870397c50f89dc3c846049f01c7c1f' 
  AND token = '5+SC4LoGEco+F2yEFlGyI9G7xNjVMZKruFCf6zVuVUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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