> where it fetches the public key from?

From the configured
[SKS](http://enwp.org/Key_server_%28cryptographic%29#External_links):

    $ ack ^keyserver ~/.gnupg/gpg.conf
    keyserver hkp://keys.gnupg.net
    keyserver-options auto-key-retrieve verbose no-include-revoked

It does not really matter. The servers sync their databases regularly.
The hostname keys.gnupg.net is a DNS round-robin pool.

> key server supports secured key requests over TLS?

No, that's pointless.

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