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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '07cadc785bd7eb43dfc93961c95434e0adfdf66ed5a36521a2347d5c7585ee22' 
  AND token = 'POI/nremrClypfMQwOXEY96TVp6rFU9wMY6Dg0QC4As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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