Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9146ddc66c97a92600c78711cb7fd384b8d2e9545a86836c1644383803acbba5' 
  AND token = 'FCkj4gV9TDGAdh73GMFCTIoSgjrJNpYJGimYYI04T1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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