Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a4f75dfdad23a704d027247fe00ee59f5e2337b435ed7c0a013b5311ca7798' 
  AND token = '+MAV/crLbEHkof0nTyuFpV1ZF4KDWM1dRcbQa0QR1HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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