Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a86e34fba30e54b5786850bae68f3c75ae45ffc6a9559cdb50a7b62da5f0ee1' 
  AND token = 'CJVNSGNgALzVKIDxOF08n5CUj09cOTIjHNA7izoRkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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