Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5befcb41fc1ac0ffb9cd73d63f1fa69bbf600e8f2eada3f49da6ac547f61559' 
  AND token = 'NcQ7Ug4tr8agS1NeOHn7Af0yiP5Xne0g7tGEWlwr0/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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