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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0660a125b632644c774c3fa0feb55122cf2b1289c18b04f570c99983d9e6a8db' 
  AND token = 'qURI0yAfoDqfy99Gpy0/9OqAER820BUyxR2SyZLYacM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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