Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253479506e53085a83fcb846f63dc3a6486da70d8343867f01b13c26d37b73b1' 
  AND token = '2f7zEM8pEkKuWxoh7fqvhUuk5O9WlKIZ4kSHxtzhh4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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