Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93984edb67d5fab5a39228fc2e200a4e6d78c66d1cc7e141ba522d6d9fee2e2a' 
  AND token = 'Hdrx1BAayK+vCvEaTUffgaMpzXuiXoAYf2ABuwyi+8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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