Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14a9dea35913d0d15bba0b5c66b1ccf5e8e9db8dc74fbdf5d9afce2b1864cad8' 
  AND token = 'Zjf0+BL+QQ+7qzCgXsjkviOJgUfOrNNWBoCuUJyrksA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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