Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d26c2a4a2c9878f63b75d916e08aa4774bcb9405063597fa9909256d351f8c' 
  AND token = 'pKsaxn4Ejm9WGdvt/yOhdoaoa0Fcgi2hgnNz3u0WEbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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