Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bb4d51792fee0ad4ba28c2c8f04b6391f249b3d2cd677f62e3b09789679de99' 
  AND token = 'I8AwkPmycVdvXz+bYXr0x1DV92osbjOk/tXGoi0DjCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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