Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd689a547ea659a120521bc2824bb51c3299f3e27445ef21ada7859a41ec321' 
  AND token = '6i/bXKKiZOVqd2utP3gZ0ctis2SUIM3XhI/mqWBQd34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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