Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '384556865909ee0a284d10a53d97e9a056a3eed15e4b964c9285c6f73c4fd311' 
  AND token = 'IkYywCyc6HDYLVHdq0yGAQK4h63AKtRaO5OhXv1DCjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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