Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f9cf340f7f10b5d612c33d03edddb91a405e29f3671a92d72ba053161a80ee' 
  AND token = 'fxR1NwN802YGDI68Pmc8HEIxPJsBfRE5NZuurvc0e60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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