Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd7c771b92b2805969fa7130934ffb53e49aefb3e543f4fc776a8cfde334a63' 
  AND token = 'VBmIhULCpbgZXrYkiNnkSnPk55RUaQ9AWet2D0Q7LUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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