Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b7a4219f93f046309f100da5d38d0b7f812c02f10db09ad5d61946409d9424' 
  AND token = 'Zz4fvRafeDmfpRBcmp1jx9Vj01ftyrfyTZ8NMvbtOnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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