Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1d2717045464a6b57ae268da988b006778d0e686b04d3202966977a1c5966e' 
  AND token = 'YBYszb0NHRGLj9gtTQ9vFPp24cm0gf4TuBlMEiu0vQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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