Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63c60cb5c939d6fe4a981c436275d0fa0c415c813a78acf2b587618eaf9dc43' 
  AND token = 'f+MwgZvnaNpfHf8w3XBIBreOilWjIOkP8OTpVjgW8vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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