Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e67e180b52f11012f866964514500354cc01da43d7855f0fffb6911cef6285cc' 
  AND token = '2upkZz4cjhzF6wUWF42MO/op6TBXa4/SBQcl89mUPhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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