Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1fa5eec9ecdc48dd88c2aaa96f04ab65f1ff0f20e67f9e1c7d0870e35de731' 
  AND token = 'Nkoy77i97fRnEB1uthHbvheoRs8BK5eHhbu9PtQt2/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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