Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68039855fdc29747e8ed9821ce3608f3d46417bac0a776e11532623689463822' 
  AND token = '0tyNr66KPyU4yCDjBDhIjiXFza4f/JjIUceSZKBoQ0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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