SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d3748232bb1d661172b2167f700117d86c2720ac769368b8652d1f28c8465d2' 
  AND token = 'HWPX1GFyhhh/97bTXMxuY6dHheMCjBOx57zqV6X+zR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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