Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de4f9766316d319fc21483010d11744807b74c961ca9c5adf63df41efdc95a4' 
  AND token = 'Z1cOBWGodlhsNN/nNbQawPSdm20c8GeX5HN00Vym+tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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