Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f9e6e5281cd19aa7456bcfbdf75d60bb631125af86e075853be66c4a8dc721' 
  AND token = '1lhCmkwvjycyXOroQtgZMK+FQs48XcLxWmG09ayN18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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