Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8bfe86a3fa500dfbc3ebf640c56dfef9e31251886f65b352d321bc69592600' 
  AND token = 'EN49/0NthXvQ/pQ6juzo5BC8UhW6cGONObqLeq8lBtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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