Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eaa9e4a8b0d83da39fda1f638fc3e2bdb998e9453ec760e5358f1c2925f8f7f' 
  AND token = 'afPbuhKIAYHgr6FkWakcU/FwcO68y0wKBqf7hK7dL3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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