Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c350bb381f76346309f321cb88ca6525c8b6b74cc6f8db6a5ba0bb7c1a764' 
  AND token = 'davhy8p2QZ/kR717S4lhZ+8r5j0cS8CaM/9PKQrJ+OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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