Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '692124bfb7b0368472be91da2f7c63995490008a25afecece68922d696213e36' 
  AND token = 'AxlQxWfNDs42R1rE1D9zD6yHMiyXVXDEAIDfXT6+4/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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