Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a52599dc258b6a20ec8ad4d192f60421e818c556ac1e1045a583237d0c3815' 
  AND token = 'cqpp1qdHbOPmrt5yKTBsNqIw58plmAeFaf+9DlVVfiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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