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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9151953ce409987070530b561cfe077b34c7ab01a26c5339845997092cc134ab' 
  AND token = 'tnn0DBCjRnNTlRi2g2GQy/UhxntIX8/YMAg5PfnLr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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