Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8039a1d418cc506edc34cb5aaa795a111fb6c739c8553a2ce8083e65df42bbc1' 
  AND token = 'FY1h+VvLLxsRuQF5m7jRtw84LzADWZm0YdR6AQo+uCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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