Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795e8e4dcfc96d463113e96aa5aad2e133cdca32fc04d895d7e98535c815f387' 
  AND token = 'KVGvMrcJpLndoC+71pUSjvV5i68zaH1PSO6fwTIgedI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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