Hi,
That's not normal. HikaShop doesn't store much in there.
On our end the table never goes above 300KB.
So I don't know what you have in it but I guess that most of the data in there could be removed.
One thing you can try is empty the table and install HikaShop. That will add back the default values and you'll have to configure again your shop settings in the HikaShop configuration.