Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7f9f5ed93ad0e159b24c9d68f0f48da5b45a8fd76a652001b12e69b7fb3421' 
  AND token = 'UTvueN4zge/NEE6QLzCSvC81mxUvdnUo1uX5E6vEIiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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