Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8828d756b6023f85f5040bf6a40ba44c28cc76a61cef5ef782ecb3fa041a9c1b' 
  AND token = 'A52ycJOfJ1jVub/JvL3gIr4LEntktPp4F97b3Z/8TWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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