Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4aada5d5ab4e02846d805a3fd03de00b62143641704abf2b85ac0dc15290e509' 
  AND token = 'aKpRHbCbcnDvTim13RhVdoFzInjB/91IejNMkf4eoj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}