Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4c1e0dd12f96f531a589fe5e7ca29a1d841fbeaf7a4fd90801d5376f983134ae' 
  AND token = 'r9xTrvvldFlneMQTR8x6DwAclkBSwAdMacYpVNhLy20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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