SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '413f2000759c7663d31dbcd38770b1a94228f1873c1dbf13b000d9ae0fd5cb99' 
  AND token = 'HjrCSRXXEl3blI/fjuFi5Y6vKquUoUcGv+bxFXrEPrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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