SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1f659abf34d1eaf471b5ebc1ef3e6c784d0e26c0b4d0a3396d57b0973348921f' 
  AND token = 'YdHpmw69yn94Gu+Q9/vMLEv84m5PL7DGaBKFNP8xR4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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