Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f839bc27264fbd49782d670783408c36fc5a274faf71041aa4edfa21e230c2b0' 
  AND token = '38wsXKlgbINo+5y4YOCtK+m+438G6KnO73AjCZinC4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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