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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aaac1a1458fd0051a6bf75185249ad9758fa66e19ef75cc75a23814f1b96adce' 
  AND token = 'l6Qc2AmXnRH9L8zicH3hLfw8LoDCtttcxz0jbdix1HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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