Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1cad2809730cd7eabe9937cccbe312e5de0c40eb1a61a68009f49824bc30d13' 
  AND token = 'gfdYK6FRkOE7tYX7ff+bIJMaMYU+1/a594rdjlQ+PJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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