Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8b00b259d3a3e7b0858a4d5f5a70095b87dc7fdaf5ab0624efc7f1a50e2031' 
  AND token = 'ThKaDWUJTnr3adYsmCJuBnURuki0AZmPfmJPhi8v/4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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