SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '70c764cc685449501e5b401676b07026bd5b872f6ab5d6bba312cf96c1352533' 
  AND token = 'ZT1IN2+aZFJCYSXWha4IoylNo+jB9qidXng9VpOkDkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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