Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35577f9f788ffbe42a5bf83dcc2d8c2aaaa0eca3f4c47c6cca55c6cd90bee928' 
  AND token = 'QZbeG1xLxuxzeJhXWNItCJR8kLIv6FDhR5aRg9gcH+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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