You can make an acrylic box frame that opens instantly, while the frame stays on the wall. No tools, no hinges, latches, or other hardware of any kind.
Have a box made of 1/4" acrylic. Choose two frames with at least 1" depth (that's important). Make one of them to fit inside the box, and the other to fit outside the box. Trim carefully, so that there is less than 1/16" clearance inside and out. Both frames will be attached to a sturdy backing board.
The acrylic box's edges fit in the groove between the inner and outer frames. I call it "Gravity Groove", because gravity is what holds the box in place. It actually rests on the top of the inner frame, so the fit along the top edge must be snug.
Where the edges of the acrylic box touch the backing board at the bottom of the groove all around, drill small holes to let air into the box when the acrylic cover is lifted off.
Lois at Superior can send you the box built to your dimensions.