Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d499be2ed785da9e97fa0a233da4b25d744988e9a42208d088ae522112b850' 
  AND token = 'OOXNNc1XWl8DBD1q4KVxiEnPrvM7I6403w7jlQzA0A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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