Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b2a53590964129e8acea93b50cccd806e6190b37d5d05cb8dbe2774f8d6cc2' 
  AND token = 'cjX4KuNHpXwLf6KfYVrIRkT+Ux97kiwPdssFMcA/oHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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