Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512adb4d7bf01e75e7bb45720fed03c272d140452a38d383c802eaba057a3c54' 
  AND token = '/rSGIh0Dq5+mmDmFYUNAxqns2/Yg6+5jukO37xGmhmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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