Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fccfcc8d784412aaa45c33fcc8f009dc21b37f325c3a43bc3003eef65e9fc51' 
  AND token = 'gMcbn5bdSOBnxlqYJEBsA6sRu4nGER/5+FQaZzu1xMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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