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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6d5582c7761aabc6487dbb02e5b4f113d50b849e42ccca70109e033d7e3b422' 
  AND token = '6qJZJcxkpqzWqZod6A7yq+onoOWpsKhEWEzXja2q+h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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