Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cd34671b0b6368deddfdf274d763b6de5689ef8fdf10d1d033183fec3356cc' 
  AND token = '7fTH0YzRA+hXdU4ZEzMWWCWvdlOv+7Ws5xeR3nsy+u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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