Hi, you will have :
- 3.3v (LP2985-XXDBVR33) regulator and the 5v (MC33269ST) if needed, in this case you will have the "on" led too.
- the atmega32U4 at 16Mhz in sleep mode (http://www.home-automation-community.com/arduino-low-power-how-to-run-atmega328p-for-a-year-on-coin-cell-battery/)
- the level converter (http://www.ti.com/lit/ds/symlink/txb0108.pdf) -> 4µA
- the pn532 in sleep mode -> 10µA
Why don't you power up the whole keyduino by the press button?