SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e80dd4a3565191358acded6f5949db22db26a6cb833e45efb2844c00c7b598f' 
  AND token = 'woJ7vzzoEnw/sa6EvZCqje2JYTkVeiCqF67/vIB7eBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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