Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '902ef01de12e862ce8398630723fc716e9ee6487eaabddcdba621f48dc084afc' 
  AND token = 'Rj8V5N0kg2kFJku/lwM9V9f22VxdjSytUkfNGBaly68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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