Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8194a20ec6e711a68cb3fe3417d4f660391a5fab91597ada33189156ee5e3e8c' 
  AND token = '2SwtkAbk+7ibXOYHiHb1Wqo+cmDuWKiKvDgfKAormEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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