Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748a235f7a1c7ed8f800785b615804ebd1fb68f348c011ddf6aae9a70ce1ba6f' 
  AND token = 'dN4ZMCW+9HOD27uaVb1L7wGvOUdkd5Ga3Ovp8BuD83E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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