Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e2bbe379c7ec4d5842024b44f3f0cdde55c34fb921d377234f7e1a444bdcdc' 
  AND token = '+n6dOkPgUrTElkYX56Z7PTMLW7XahdBrFke8DudUaIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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