Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e3fcb1076583977c52921543e3b8879af9718c96738730b3a36a16a86fe8238' 
  AND token = 'rHwOeoIzIVxhpRp8Jdxt3inW/pY55dJ/NF4BrMp/290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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