Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609a94b237dcdcb6fddf786e2238cb8547a3171e5efbb9d2cd84b3a4073e47d9' 
  AND token = 'FD/H4dcmEgaGrMtgj8LlLkXlbUal9+7b+FQgayQ909w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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