Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3cb37374a53691876423e829ac92d0dd44103cedbd3e46339d59d3f3429337' 
  AND token = 'myukzb80QDKwgEFeEHieUYtlaV2n9aX9d7XUJ8jlPqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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