Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2831aa4fcd370c6cbcc3416d5ea1f4fb1be16715fc0dc8a7b12a18d652bce7ce' 
  AND token = 'jf44fU/rpak10AXvvBd+/F2J165yIBRi7E7LzaT+Gzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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