Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3938a5f9181efd46dde56b5dce39d5d4f3381348a894602f23dd40b8d172ea0' 
  AND token = '8yGoi4eDyBPwmXZ162mWGZEs5uBzgFz+4KXQfvsU3fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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