SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e653076e1c071a920bba668ef350fe8ce17b76d73d288dbfdfa8a9e23480e819' 
  AND token = '2Y6rVzhBYhghFZzPY9FAsIMtPMyx6tiJYvcSeoVdJKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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