Selecting all keys in a single frame in one click

Hi, I am wondering if there is any way to select all keys in a single frame in one click, in order to copy and paste keys like you would do in most 3d programs… Like for example, in Maya, having multiple animated objects selected, you copy keys in the timeline or in the dope sheet summary and paste them wherever you want without having to marquee select all the keys in the curve sequencer like in Unreal. Selecting them in the sequencer would be even worse.

ANy help would be greatly appreciated. Thanks!