SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e3beb04ef9f80422c7e787db0895c790b6b4bdbf251a18fc154e6b6fa20c42b3' 
  AND token = '2ZqzppsvZrJPY/n631/okPNeQKxiEdV4ZCikexMEuIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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