Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4729532666b2bc91f3490408cedde15604908b8e01af6525b14bbc92bd96b135' 
  AND token = 'owfJogsAvaHxNnHkixOyr3GM7MmLT47/0yAGYmiCRbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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