Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffd4235feea4dd33f1291549a2dd0f8bf7fdb117eab5e955e53e0960c61c1bf' 
  AND token = 'ISHmVqJRZy03tfEAg6WuDzzETCXzl2KwzCFwSST9KcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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