Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235466c378626f376b55480d2b2c5f9b8c54d6372788f93d827c595f25a445cb' 
  AND token = '/SIBQcMudA+xXDeu16m3AkrWFKneSUQJdESOUnDQ6mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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