Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe2c3f6b4d7ad8014813b03e04a5450c9bf341f9184641f361a1c4ed977749a' 
  AND token = '4gN2H5y/g9AEkiy9yNmWcOrOKi6r3SfWghCjI+ICnDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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