Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ae5e4c3850f631e734def5765053d6a055094a8ae9373f4f80a00dd6c20d71c' 
  AND token = 'CTcbOPQ4eCtS5K4wo7FXKVn7cErdnelLlHtJc2lz/GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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