Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '28ba3d8c630de24388a2ea0fd2293e13d637d841301e7a1fcb20fed6964a97c9' 
  AND token = 'FWX28dZlD3zj4XKIerXoiQYxjhuf0Sz3sX2O388b8n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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