Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532c274845d6760504e634c3bc9166c63d6d7fced2981ed1ad2b19d86e80db7c' 
  AND token = 'QLhl+g7NFgQ+rAvhsRINsMAf3qBhFT/sfIRstcxvnj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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