Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845b74c4367c02bb6c3fdc0fcef6ac9d9fe5429fb663cf383ac6963db4f4c8a3' 
  AND token = 'IAI9uIAglaLz1p+zubG5gUOvDwP3OTXtFmaSXq5sWi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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