SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '945375c6ce0c60df462673da5292e2007ea98972a1c4cc9d883808f328a2acfd' 
  AND token = 'TOri+GEHMW2zB3wykJvbss2ZJOSxpCMERT0Te+CXzK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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