Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16d2837b44e859ba2ee15f6d2a95a27bb70d54d68c885b9fe1ce3c2f6fd46e98' 
  AND token = 'ZRfhAL5lWbabY3cxmd3sD1iLvqP6EUptynXvpkttNKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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