Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '816b2d59cedb379b02408543ccac05ace2c061b3ed8e89a61d4cbcca768f555a' 
  AND token = 'jNMsgy71kCTOQMuta4N21BLvi8aMP3YMc8PQctABJ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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