Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ce1a48611b2f412adaee35614693c9b6dcbad4bf607cb6aa84e799006e524b' 
  AND token = 'HKRvWRhw7aL45AdSsArx+ZwDh6rvi8xc13K7jDNug4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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