SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1b72e901c394b990ea7c762b7502b8f9323f11eb8184f1fb099e3dc5634f31c4' 
  AND token = 'JfLlkF4mVa7jovcGqXG+/mUH9GnNnXPsfVraDdy2edk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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