Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d28fa79f7f1ced6086fc03cfcd18c61002cf6fe4f7b5eb5e49f40ee4fceeb55' 
  AND token = 'j6S1tTaGzxoPWIYrZuFQ84L7QavnIYRg0Fq4xvI1yZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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