Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ee1ca2e4b1cd7e06a95c1240be3f57a5eea3f0bafe11063115fa8d31a7aa49d' 
  AND token = '4f5lOOAZltM6Yx0i4pTkwJfYQzuIMtkskLgomiSxynI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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