Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53f81bd6042d3cd39ed57ce044d4ffd2ea1fdb340261d85086653aaed44eebc5' 
  AND token = 'z6aDf76iCACrf/gpPM0i5Ut42e85MlVc0MzYubkVCZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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