Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef632d97cc4ee633a66ae052daa00de21cfed0a327fcf241234f4537c84694f' 
  AND token = 'Iv4YapbOoxt5dDEz5IH8jvIztohCWx0BhRemSdbiZh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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