SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e147582b58d6223911d36b4e19f394f53799388d8b596f43b7bea670720a92ce' 
  AND token = 'hBvfywkGHDWj6IZ+tt7CeSM2U8TjsiC4c1V06WdlAMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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