you would need to mark the value down to below the level where duties kick in. this is different for different countries and usually different if the item is a personal gift or a commercial sale.
please note if the senders address is a business one customs will always consider the goods commercial even if you mark the package as gift.
the €45 fee would include a handling charge which could be as much as half that fee.
I would suggest marking the value down to no more than $20 and mark the package as gift.