Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123db4cde81133a32284bec67371a4d4c43a17a7712e15f501340b89bf9bb644' 
  AND token = '0uHI3yeCOgZxDUUmTkS9+En+MQIfgorNLEzGiAlmpwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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