Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9f29f38db7bfc1d78dde84996b056cfeaa6f89b88d530080b0e2c030ae82f2' 
  AND token = 'ef0rPfwlivL/pCkXLosxqAdFQBNNjtNOFyStLh8EL2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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