Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6acb2547a49ce38819031d3b80b878f7f700b6ba16ef2dfe69833da5ba61cdf' 
  AND token = 'JI7FyEwkCHaSZA6AQL5wFWuX0IS8rdAx2a95DhZYgAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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