Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68e77c1fc001e3168b662a9ae7eada8b450454f8c2476f8c690b2f689ce61f8d' 
  AND token = '9OHsJJFntW0ddOwhFLn8wBJDou8I8JZMhWuUqbkqges=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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