SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '65a62f72faa8ec61ce0955f82398468642c0fb16ae4444ebe8c4ef29dded248b' 
  AND token = 'GzCjLqzYJjDyfIYHYIh/pVF1l3d0zQBHakbOJDEF0Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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