Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5b1c0fd2eb2d036e662463d7cd57f17d24595c7ad278c20eba0a32b7ef2836a' 
  AND token = 'AOmMp1xNokcFWheLcn79S1uwpxhIO+nmYIwI418j0m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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