Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38e8cc614c26dccaa6dcffd481a5585291448bef9c438efa5356d39e31acb76' 
  AND token = '+yqqa8g4HI8pJBkWkFPXM72S/ZLBR9plYkB/GGn4oNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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