Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cbbc4369da832e1cf95bb060b1642a81d71aca89fa057e73db548d547f6209' 
  AND token = 'jZ8ERFSq8CB6FmTJ6eyCeWBPdmup1kbDwykXQCDzK9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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