Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684a7873515ca0e9936eee128d3239735af547807087da862f2e6817f390dbf9' 
  AND token = 'waBknGML4gdsZH1mwBnaQeZ1lBpLSTdoZq7rkXWzmxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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