Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7671130a65281870dff9132a60b6741e40f9f40c431586431ee7355de1661c4' 
  AND token = 'FpQWwczevE2I6fa84etUWarHByFGxKrLPo0fwMm9Y5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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