SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf39a0017beab7802d4c880e5b2bb8a16919aca8012629e3d926e4d28bc324be' 
  AND token = 'YB8n/+z5fpV3oFIHZ4KEkw4BGj9kaKhU0PfcqO1LXHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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