Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3f9dfea6e195a32019c9c8f65f945249a826aa78b5e09ca8b5a7a206fb6d10' 
  AND token = 'yaGMv4IrXzY/v0SgyZBv0OsURoAu54gBMbxhsUpmL9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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