Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff5c2eb4323886a1668d916fa9ffe25ec518e1e4d1e749ad72af0907c28e117' 
  AND token = 'dJkvDNwXkyFLtV136NO4bGvjZyacDoQVlAVznYSwwRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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