Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3d5bb0b7ba0dc817ef227df44bab4bd1cc0fcb273a5353cad5f046a10abc15' 
  AND token = 'QIy9LL7BRxV2e6utFKqxRUlpM5jgEt+4D5IbUVdQSo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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