Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dc5b1b6126195c4e6b9ed9ce757044aa6e02bc0a2ac83463068eca18bbab68' 
  AND token = 'mT/Rha/vgI4NW9YYpGpa9DDxHHVbmWjjJiP2JgGo7QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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