Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28dc4ff1f62c1ba9dc315730ed7b44f3c2b23fb7a478febd228328b0529cf95' 
  AND token = 'gF9o9bHO8FfAOY/M0JY25cObV/SeGjIDd9PZ5dPlkOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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