Depending on your configuration the URL for your product is not the same with the url key.
Check the settings in
Stores > Configuration > Catalog > Search Engine Optimization.
By default product URLs have an suffix
.html. So most likely your URL is
whiskware-egg-mixer.html. If your are using category paths in URLs there should also be additional entries in the url_rewrite table for your product.
For getting the exact URLs of your product in your system I would suggest to check the
url_rewrite table like this:
select * from url_rewrite where entity_id = [your product id] and entity_type = 'product';
-- for your example use
select * from url_rewrite where entity_id = 75 and entity_type = 'product';
This should give you a hint if something is going wrong.