Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb4eadd88c19dbba17ede933c2bca2c8d5fc7786c4ca098ae78c2f05978ee54' 
  AND token = 'SJhVScsT7F7v2p8nhOgKG6qAtZ8n2vwRXuAcd5yqfV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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