Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff804a02683f49c78af5f17ac53ec68fed1f85b54a346e5c9766d0b154cf7a91' 
  AND token = 'DWjHnxOP6HZqt59rFyS5DgG7NdcmLUQdDY1M5/Lqsr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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