Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ecee3a233f411f154fbdafb8b5df43e240eb567233f1c4373aecac269fb2e3' 
  AND token = 'FyBscmS+BMDV2ayJGwVsNgMN7/8S9D3GcW5OuPhe5yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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