Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da15f2509618e8d3b6a1f19d479718b94f96ad333780dc2d7837faec4c764827' 
  AND token = 'dxYrMCN2OxqP0dlz4YYmc9DxLoQIpxQI0a9vmGDCtj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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