Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bab8bfb261f486d2334fec599f7d4762fd3ed2d94f5bbee3819827f501de864' 
  AND token = '9PIdij8h6czMn72AVTALvX7HvrmrJUN0vr/e2KkAr20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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