Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ba361d08223b0dd4fd599fc731f7ea61a7d7907d26f2ff469b9f5be239a55c' 
  AND token = 'HEB5aIBTrjRcmxWSVKcaqKCKb/QJIHrYHwSbXrQJfqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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