Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2401815dbc4ad6d1bedd4ffff6379d87a3f9b41ceaaf34884fc5dffbe4daa3ae' 
  AND token = 'DJ3gOWgBtNloL3Eo9HLVQ853EJ3Wpew6azqtvQLBHnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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