How to set default console keyboard layout in Arch Linux?

At least for Arch, you have two types of configuration: via console and Xorg.

The easiest way without configuring Xorg:

$ sudo setxkbmap -layout us

You can see the current configuration with this:

$ setxkbmap -print -verbose 10
$ localectl status

To list all the available key maps or layouts:

$ localectl list-keymaps

Check (my) /etc/vconsole.conf:

KEYMAP="hu"

See releated wikipage for more information!