Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685e73936e81f9c045fbb4775f71be00e64f300d088097903468aaa7dff12ba4' 
  AND token = 'Ew8LzRIxaREXDB9PB5WrwaU9D0isQzraNTBvtUVVePU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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