Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dde3eb58a60f21359608176d07e70cbf53083579b629f64ce6485f255cde639' 
  AND token = 'ttmyPyJI3UAXUn07iwKSf0GplzABngdc92ViXplKBb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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